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The paper gives .0015 fudge room on both sides of center. So if your hole is off center just a little bit, the casting will still fall out of the mold.
When you remove the paper the cavity is reduced in volume.

You could drill holes ok, but if the holes are not centered on the parting line of the blocks the cores do not want to fall out.
Don't mount the blocks on the handles until after drilling the cavities. The fasteners are cleverly designed to not...

Charts for calculating weight of cores are here. www.castboolits.gunloads.com/showthread.php?276943-A-Little-Math-That-Will-HOPEFULLY-Be-Helpful
Post #8 is where Gitano helped a lot. You still have to do some math.
I have cut a few core molds on...

This question comes up so often.
Brass is a little harder than copper, but compared to steel, brass is soft.
Hot copper is sticky, but the addition of zinc makes brass comparatively slick.
Most bullets are jacketed with gilding metal, which...

Before posting any pics I open them with the Paint program on my computer and resize them. Most from my phone are 4000 x 3000 or so pixels. I resize to 1000 or less, then crop, then save. They load up much quicker for me. I'm not computer...